cognitive psychology. PhD 
Teaching a 1-credit course on design & implementation of DSLs. What's your favorite DSL? Hoping to find some gems off the beaten path.
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Halide! DSLs for optimizing performance are cool, and algorithm + schedule separation is a great concept to show students.
For more off-the-beaten-path, some recent graphics DSLs: * Opt for non-linear least-squares optimization http://optlang.org/ * Ebb for physical simulation http://ebblang.org/ Both are written in Terra, a DSL for writing high-performance DSLs http://terralang.org/ .
